1: N2O4 / CCl4 2: Fe, AcOH 3: aq. HCl / Heating View Scheme

formic acid; triethylamine; (1R,2R)-N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine; [Ru2(p-PriC6H4Me)2(μ-Cl)Cl]2 in dichloromethane T=30°C; 13 h;